Hammer mill cylinder



May 16, 1933. LA MONT A. MCDOWELL 1,909,623

HAMMER MILL CYLINDER Filed Sept. 23, 1931 Patented May 16, 1933 UNITED STATES PATENT OFFICE HAMMER MILL CYLINDER Application filed September 23, 1931. Serial No. 564,535.

This invention relates to improvements in hammer mill cylinders.

One of the objects of the present inventlon is the provision of an improved hammer mill cylinder assembly preferably of that type wherein the hammers are of the reversible type and the construction of the cylinder is such as to permit these hammers to be readily reversed without taking the entire cylinder construction apart.

Another object of the present invention is the provision of a hammer mill cylinder which includes a plurality of discs, securely bolted together with spacing sleeves mounted upon the connecting bolts to retain the discs in equal spaced relation and includes hammer pins removably positioned in the intermediate discs for supportinghammers thereon, together with means whereby the retaining bolts can be loosened and one of the outside discs rotated to present each one of the hammer pins in alignment in the opening in this disc whereby the hammer pins can be re- 1 moved from the discs in reversing the position of the hammers: thereon.

A further object of the present invention is the provision of an improved type of hammer mill cylinder which includes a plurality of discs arranged in equal spaced relation with the outermost discs rotatably mounted upon a shaft, while the intermediate discs are engaged with a polygonal portion on the shaft for rotation therewith, whereby when the securing pins or bolts are removed from the proper relative positions.

lVith the above and other objects in view, the invention consists in the novel features of construction, the combination and arrangement of parts hereinafter more fully set forth, pointed out in the claims and shown in the accompanying drawing where-.

of Figure 1; and,

- discs, the said disc will be retained in their Figure 3 is a sectional view on the line 3-3 of Figure 1.

Referring more particularly to the drawing, 1 indicates the drive shaft provided with a polygonal portion 2. In the construction w of the hammer mill cylinder, I provide two outside discs 3 and 4 which are mounted upon bearing portions 5 on the shaft 1, while the intermediate discs indicated at 6 are provided with polygonal central openings to receive the polygonal portion 2 of the drive shaft, so that the entire cylinder assembly will rotate with the drive shaft.

All of the discs 3, 4,, and 6 are connected by means of clamping bolts 7 which are arranged in circumferential spaced relation around the shaft 1 and which are passed through suitable openings in the discs with spacing sleeves 8 mounted on the bolts between the discs, While a nut 9 is threaded on one end of each of the bolts for retaining them in operative position.

The hammers 10 are mounted upon suitable pins 11 which pass through open ngs in the intermediate discs 6 and have reduced trunnions 12 which lit within suitable openings in the outside discs 3' and 4. If the hammers 10 are not of a width equal to the space between the discs, suitable collars 13 can be mounted on the pins 11 and positioned between the hammers and the adjacent disc for securely retaining the hammers in their respective positions when the bolts 7 are clamped onto the outside discs 3 and 4, as shown in Figure 2.

The disc 3 is provided adjacent its peripherywith an opening 14 which is preferably of circumferential alignment with the openings through which the trunnions 12 project.

and the bolts have their threaded ends/with- 2 reoaeaa drawn from the disc 3 to permit rotation of this disc. The disc 3 is then moved laterally from the adjacent disc 6 until the trunnions at one end of the pins 11 are withdrawn from the disc 3. The disc 3 is then rotated until the opening 14 aligns with the first one of the pins 11. The pin 11 can then be removed, releasing the hammers 10 which may be mounted thereon, the relative positions of the hammers can then be reversed and the pin 11 replaced to secure the hammers in place between the discs in their reversed positions.

The above operation can be carried out with all of the pins 11 and the respective hammers mounted thereon until all of the hammers of the cylinder have been reversed in position. The bolts 7 can then have their threaded ends replaced in their respective openings in the disc 3 and the nuts again threaded onto the bolts. In order to retain the nuts 9 in position on the bolts, suitable cotter pins 16 are passed through the nuts and through the bolts, as shown in Figure 1.

It will be apparent from the foregoing that I have provided an improved hammer mill cylinder assembly, wherein hammers of the reversible type are securely held in position in the cylinder and the hammers may be quickly and easily reversed through the movement of the bolts 7 and the removing and replacing of the pins 11. In view of the fact that the majority of the discs are mounted on the polygonal section of the drive shaft 1, it is believed that applicant has provided novel means for providing a hammer mill cylinder, as well as assembling a cylinder of this type wherein the hammers can be quickly and readily reversed as to their position relative to the cylinders.

While I have shown and described the preferred embodiment of my invention, it will be apparent from the foregoing that slight changes may be made in the construction when putting the invention into practice without departing from the spirit of the same or the scope of the appended claims.

I claim:

1. A device of the class described including a driven shaft, a plurality of spaced supporting plates carried thereby, said plates having circumfcrentially arranged openings adjacent their peripheries with the openings in the outer plates of smaller diameter than the other openings, pins arranged in the larger openings having reduced trunnions to be fitted in the smaller openings, one of said outer plates having an opening adjacent its periphery adapted to be aligned with any of the openings in the other plates, whereby the pins may be removed, and bolts for binding the plates together in spaced relation.

2. A hammer cylinder comprising a shaft, a gang of discs secured thereto having sets of aligned apertures, a pin removing aperture 

